Return the real host for the given WSGI environment. This first checks the X-Forwarded-Host header, then the normal Host header, and finally the SERVER_NAME environment variable (using the first one it finds).
Optionally it verifies that the host is in a list of trusted hosts. If the host is not in there it will raise a
- environ – the WSGI environment to get the host of.
- trusted_hosts – a list of trusted hosts, see
host_is_trusted()for more information.